H&R 60mm ID Single Race Spring Length 160mm Spring Rate 260 N/mm or 1484 lbs/inch 2021-mazda-mx-5-miata-esi6955527 ZX6-XTR4 kit features an Xtreme

ZX6-XTR4 kit features an Xtreme pressure plate for the most demanding driver

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H&R 60mm ID Single Race Spring Length 160mm Spring Rate 260 N/mm or 1484 lbs/inch 2021-mazda-mx-5-miata-esi6955527 ZX6-XTR4 kit features an XtremeH&R 2. 50" I. D. Race Springs are made with extremely high tensile strength wire alloy which allows the use of a thinner wire. Manufactured using advanced materials and precision technology in Germany, H&R 2. 50" I. D. Race Springs are crafted from special lightweight (hf) 54SiCr6 spring steel. For any given spring rate, they are on average 15% lighter and have 10% more travel than competitors' springs. Main springs range from 6" to 18" in length and